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# Bound Tolerance Problem

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HELP!!!

We are students and we have an error message that we cannot understand.

We know that 500 is the parameter DemOp2 for j=1 (the 1st month).

We tried everything we could to solve the problem to have a solution but nothing works.

If anyone could help us, we would be infinitely grateful.

Thank you so much.

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Best answer by mohansx 11 November 2022, 17:30

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Userlevel 5
+5

I think it is just a problem with how the constraint is written with mismatching indexes.

Constraint CDemOp2(i, j) has a definition DProd(i|i=2, j) = DemOp2(j)

The mismatch is between CDemOp2(i, j) and DProd(i|i=2, j)

When i=1 and j=1, the condition i|i=2 will be false (it will be true only when i = 2), so the constraint definition will essentially be 0 = DemOp2(1), which is the error you are seeing.

What is the logic behind DProd(i|i=2, j) ? Your current constraint essentially models

CDemOp2(j) with definition DProd(2, j) = DemOp2(j)

Userlevel 6
+6

My assumption is that you want to limit the constraint domain to only generating constraints where i=2. You can do this by defining the index domain of CDemOp2 as

(i, j)|(i=2)

and the definition then as

DProd(i, j) = DemOp2(j)

Now there are only constraints generated for i=2 and all j.

Thanks everybody !!

We found our problem